| 1 |
<?php |
| 2 |
/** |
| 3 |
* Analytics service. |
| 4 |
* |
| 5 |
* Thin wrapper around the PostHog capture API. Sends anonymous product |
| 6 |
* analytics so the WCPOS team can understand how the plugin is used and |
| 7 |
* make better product decisions. |
| 8 |
* |
| 9 |
* Events are only sent when the user has explicitly opted in via the |
| 10 |
* `tracking_consent` setting. All calls are no-ops otherwise, so callers |
| 11 |
* can invoke them unconditionally. |
| 12 |
* |
| 13 |
* @package WCPOS\WooCommercePOS\Services |
| 14 |
*/ |
| 15 |
|
| 16 |
namespace WCPOS\WooCommercePOS\Services; |
| 17 |
|
| 18 |
use Ramsey\Uuid\Uuid; |
| 19 |
use WP_User; |
| 20 |
use const WCPOS\WooCommercePOS\VERSION as PLUGIN_VERSION; |
| 21 |
|
| 22 |
/** |
| 23 |
* Analytics service class. |
| 24 |
*/ |
| 25 |
class Analytics { |
| 26 |
/** |
| 27 |
* Default PostHog project token. |
| 28 |
* |
| 29 |
* Client-side PostHog project tokens are designed to be public. They |
| 30 |
* authorize event ingestion into a specific project only. |
| 31 |
* |
| 32 |
* Override with the `WCPOS_POSTHOG_TOKEN` constant if needed. |
| 33 |
* |
| 34 |
* @var string |
| 35 |
*/ |
| 36 |
const DEFAULT_TOKEN = 'phc_BhTJzZ7fXMqcD4MiaUJQsQqPkEpu94yoSAthXFBWemvd'; |
| 37 |
|
| 38 |
/** |
| 39 |
* Default PostHog ingestion host. |
| 40 |
* |
| 41 |
* Uses a reverse proxy on wcpos.com to reduce the chance of being |
| 42 |
* blocked by privacy tooling. Override with `WCPOS_POSTHOG_HOST`. |
| 43 |
* |
| 44 |
* @var string |
| 45 |
*/ |
| 46 |
const DEFAULT_HOST = 'https://ph.wcpos.com'; |
| 47 |
|
| 48 |
/** |
| 49 |
* Capture endpoint path. |
| 50 |
* |
| 51 |
* @var string |
| 52 |
*/ |
| 53 |
const CAPTURE_PATH = '/capture/'; |
| 54 |
|
| 55 |
/** |
| 56 |
* HTTP request timeout in seconds. |
| 57 |
* |
| 58 |
* Kept low because capture is fire-and-forget. We set |
| 59 |
* `blocking => false` in practice, but the timeout still applies to |
| 60 |
* the TCP connect step. |
| 61 |
* |
| 62 |
* @var float |
| 63 |
*/ |
| 64 |
const REQUEST_TIMEOUT = 2.0; |
| 65 |
|
| 66 |
/** |
| 67 |
* Singleton instance. |
| 68 |
* |
| 69 |
* @var null|self |
| 70 |
*/ |
| 71 |
private static $instance = null; |
| 72 |
|
| 73 |
/** |
| 74 |
* Cached consent state for the current request. |
| 75 |
* |
| 76 |
* @var null|bool |
| 77 |
*/ |
| 78 |
private $enabled_cache = null; |
| 79 |
|
| 80 |
/** |
| 81 |
* Get the singleton instance. |
| 82 |
*/ |
| 83 |
public static function instance(): self { |
| 84 |
if ( null === self::$instance ) { |
| 85 |
self::$instance = new self(); |
| 86 |
} |
| 87 |
|
| 88 |
return self::$instance; |
| 89 |
} |
| 90 |
|
| 91 |
/** |
| 92 |
* Reset the singleton. Intended for tests only. |
| 93 |
*/ |
| 94 |
public static function reset_instance(): void { |
| 95 |
self::$instance = null; |
| 96 |
} |
| 97 |
|
| 98 |
/** |
| 99 |
* Whether analytics is enabled for the current site. |
| 100 |
* |
| 101 |
* Returns true only when the user has explicitly allowed tracking |
| 102 |
* via the general settings. Cached for the duration of the request. |
| 103 |
*/ |
| 104 |
public function is_enabled(): bool { |
| 105 |
if ( null !== $this->enabled_cache ) { |
| 106 |
return $this->enabled_cache; |
| 107 |
} |
| 108 |
|
| 109 |
$consent = woocommerce_pos_get_settings( 'general', 'tracking_consent' ); |
| 110 |
$this->enabled_cache = ( 'allowed' === $consent ); |
| 111 |
|
| 112 |
return $this->enabled_cache; |
| 113 |
} |
| 114 |
|
| 115 |
/** |
| 116 |
* Clear the cached consent state. |
| 117 |
* |
| 118 |
* Useful after programmatically changing the consent value within a |
| 119 |
* single request (for example, the AJAX consent notice handler). |
| 120 |
*/ |
| 121 |
public function clear_consent_cache(): void { |
| 122 |
$this->enabled_cache = null; |
| 123 |
} |
| 124 |
|
| 125 |
/** |
| 126 |
* Capture an event. |
| 127 |
* |
| 128 |
* No-op unless analytics is enabled. Automatically attaches the |
| 129 |
* current user's UUID as `distinct_id`, groups the event under the |
| 130 |
* site UUID, and merges in a small set of default context properties. |
| 131 |
* |
| 132 |
* @param string $event Event name, e.g. `pro_link_clicked`. |
| 133 |
* @param array $properties Event properties. Caller-supplied values |
| 134 |
* take precedence over defaults. |
| 135 |
* |
| 136 |
* @return bool True when a request was dispatched, false otherwise. |
| 137 |
*/ |
| 138 |
public function capture( string $event, array $properties = array() ): bool { |
| 139 |
if ( ! $this->is_enabled() ) { |
| 140 |
return false; |
| 141 |
} |
| 142 |
|
| 143 |
if ( '' === $event ) { |
| 144 |
return false; |
| 145 |
} |
| 146 |
|
| 147 |
$distinct_id = $this->get_distinct_id(); |
| 148 |
if ( '' === $distinct_id ) { |
| 149 |
return false; |
| 150 |
} |
| 151 |
|
| 152 |
$merged_properties = array_merge( $this->get_default_properties(), $properties ); |
| 153 |
|
| 154 |
// PostHog reserves $identify / $groupidentify for person / group |
| 155 |
// definitions. Auto-attaching a $groups binding to those would |
| 156 |
// either duplicate the event's own $group_type/$group_key or |
| 157 |
// incorrectly cross-link them to an unrelated group, so only |
| 158 |
// attach $groups to regular events. |
| 159 |
if ( ! $this->is_reserved_event( $event ) ) { |
| 160 |
$site_id = $this->get_site_id(); |
| 161 |
if ( '' !== $site_id ) { |
| 162 |
$merged_properties['$groups'] = array( 'site' => $site_id ); |
| 163 |
} |
| 164 |
} |
| 165 |
|
| 166 |
$payload = array( |
| 167 |
'api_key' => $this->get_token(), |
| 168 |
'event' => $event, |
| 169 |
'distinct_id' => $distinct_id, |
| 170 |
'properties' => $merged_properties, |
| 171 |
'timestamp' => gmdate( 'c' ), |
| 172 |
); |
| 173 |
|
| 174 |
return $this->send( self::CAPTURE_PATH, $payload ); |
| 175 |
} |
| 176 |
|
| 177 |
/** |
| 178 |
* Capture an impression-style event at most once per de-dup window. |
| 179 |
* |
| 180 |
* Impression events such as upgrade CTA views can otherwise fire on |
| 181 |
* every page render — a persistent admin link or a product-edit upsell |
| 182 |
* field would emit hundreds of identical events per user, drowning the |
| 183 |
* funnel and inflating ingestion. This de-duplicates per current user + |
| 184 |
* key using a short-lived transient, so each impression slot is counted |
| 185 |
* at most once per window. |
| 186 |
* |
| 187 |
* @param string $event Event name, e.g. `upgrade_cta_viewed`. |
| 188 |
* @param array $properties Event properties. |
| 189 |
* @param string $dedup_key Stable key for the impression slot (for |
| 190 |
* example, the placement). Combined with the |
| 191 |
* event name and current user UUID to form the |
| 192 |
* transient key. |
| 193 |
* @param int $ttl De-dup window in seconds. Defaults to a day. |
| 194 |
* |
| 195 |
* @return bool True when an event was dispatched, false when suppressed |
| 196 |
* or analytics is disabled. |
| 197 |
*/ |
| 198 |
public function capture_once( string $event, array $properties = array(), string $dedup_key = '', int $ttl = DAY_IN_SECONDS ): bool { |
| 199 |
if ( ! $this->is_enabled() ) { |
| 200 |
return false; |
| 201 |
} |
| 202 |
|
| 203 |
$distinct_id = $this->get_distinct_id(); |
| 204 |
if ( '' === $distinct_id ) { |
| 205 |
return false; |
| 206 |
} |
| 207 |
|
| 208 |
$transient_key = 'wcpos_imp_' . md5( $distinct_id . '|' . $event . '|' . $dedup_key ); |
| 209 |
if ( false !== get_transient( $transient_key ) ) { |
| 210 |
return false; |
| 211 |
} |
| 212 |
|
| 213 |
$dispatched = $this->capture( $event, $properties ); |
| 214 |
|
| 215 |
// Only record the de-dup marker once the event actually dispatched, so |
| 216 |
// a transient network failure does not permanently suppress the slot. |
| 217 |
if ( $dispatched ) { |
| 218 |
set_transient( $transient_key, 1, $ttl ); |
| 219 |
} |
| 220 |
|
| 221 |
return $dispatched; |
| 222 |
} |
| 223 |
|
| 224 |
/** |
| 225 |
* Set person properties on the current user. |
| 226 |
* |
| 227 |
* Uses the PostHog `$identify` event. Properties set via `$set_once` |
| 228 |
* only apply the first time they are seen. |
| 229 |
* |
| 230 |
* @param array $set Properties to set (overwrite). |
| 231 |
* @param array $set_once Properties to set only on first sighting. |
| 232 |
*/ |
| 233 |
public function identify( array $set = array(), array $set_once = array() ): bool { |
| 234 |
if ( ! $this->is_enabled() ) { |
| 235 |
return false; |
| 236 |
} |
| 237 |
|
| 238 |
$properties = array(); |
| 239 |
if ( ! empty( $set ) ) { |
| 240 |
$properties['$set'] = $set; |
| 241 |
} |
| 242 |
if ( ! empty( $set_once ) ) { |
| 243 |
$properties['$set_once'] = $set_once; |
| 244 |
} |
| 245 |
|
| 246 |
return $this->capture( '$identify', $properties ); |
| 247 |
} |
| 248 |
|
| 249 |
/** |
| 250 |
* Set group properties. |
| 251 |
* |
| 252 |
* Uses the PostHog `$groupidentify` event. Every plugin install maps |
| 253 |
* to a single `site` group keyed by the site UUID. |
| 254 |
* |
| 255 |
* @param string $group_type Group type, e.g. `site`. |
| 256 |
* @param string $group_key Group key, e.g. the site UUID. |
| 257 |
* @param array $properties Group properties. |
| 258 |
*/ |
| 259 |
public function group( string $group_type, string $group_key, array $properties = array() ): bool { |
| 260 |
if ( ! $this->is_enabled() ) { |
| 261 |
return false; |
| 262 |
} |
| 263 |
|
| 264 |
if ( '' === $group_type || '' === $group_key ) { |
| 265 |
return false; |
| 266 |
} |
| 267 |
|
| 268 |
return $this->capture( |
| 269 |
'$groupidentify', |
| 270 |
array( |
| 271 |
'$group_type' => $group_type, |
| 272 |
'$group_key' => $group_key, |
| 273 |
'$group_set' => $properties, |
| 274 |
) |
| 275 |
); |
| 276 |
} |
| 277 |
|
| 278 |
/** |
| 279 |
* Get the PostHog project token. |
| 280 |
* |
| 281 |
* Allows override via constant (`WCPOS_POSTHOG_TOKEN`) or filter |
| 282 |
* (`woocommerce_pos_posthog_token`) for self-hosted deployments. |
| 283 |
*/ |
| 284 |
public function get_token(): string { |
| 285 |
$token = \defined( 'WCPOS_POSTHOG_TOKEN' ) ? (string) \WCPOS_POSTHOG_TOKEN : self::DEFAULT_TOKEN; |
| 286 |
|
| 287 |
/** |
| 288 |
* Filters the PostHog project token used for analytics. |
| 289 |
* |
| 290 |
* @since 1.8.14 |
| 291 |
* |
| 292 |
* @param string $token The default project token. |
| 293 |
*/ |
| 294 |
return (string) apply_filters( 'woocommerce_pos_posthog_token', $token ); |
| 295 |
} |
| 296 |
|
| 297 |
/** |
| 298 |
* Get the PostHog host URL. |
| 299 |
* |
| 300 |
* Allows override via constant (`WCPOS_POSTHOG_HOST`) or filter |
| 301 |
* (`woocommerce_pos_posthog_host`). |
| 302 |
*/ |
| 303 |
public function get_host(): string { |
| 304 |
$host = \defined( 'WCPOS_POSTHOG_HOST' ) ? (string) \WCPOS_POSTHOG_HOST : self::DEFAULT_HOST; |
| 305 |
|
| 306 |
/** |
| 307 |
* Filters the PostHog host URL used for analytics. |
| 308 |
* |
| 309 |
* @since 1.8.14 |
| 310 |
* |
| 311 |
* @param string $host The default host URL. |
| 312 |
*/ |
| 313 |
return untrailingslashit( (string) apply_filters( 'woocommerce_pos_posthog_host', $host ) ); |
| 314 |
} |
| 315 |
|
| 316 |
/** |
| 317 |
* Get the distinct ID for the current user. |
| 318 |
* |
| 319 |
* Returns the user's POS UUID meta, lazily provisioning it if |
| 320 |
* missing. This matches the existing pattern in |
| 321 |
* `Templates\Frontend` for users who load the POS frontend, and |
| 322 |
* ensures analytics events from the WP admin (where `Frontend` is |
| 323 |
* never loaded) still have a stable `distinct_id`. |
| 324 |
* |
| 325 |
* Empty string when no user is logged in. |
| 326 |
*/ |
| 327 |
public function get_distinct_id(): string { |
| 328 |
$user = wp_get_current_user(); |
| 329 |
if ( ! $user instanceof WP_User || 0 === $user->ID ) { |
| 330 |
return ''; |
| 331 |
} |
| 332 |
|
| 333 |
$uuid = get_user_meta( $user->ID, '_woocommerce_pos_uuid', true ); |
| 334 |
if ( \is_string( $uuid ) && '' !== $uuid ) { |
| 335 |
return $uuid; |
| 336 |
} |
| 337 |
|
| 338 |
$uuid = Uuid::uuid4()->toString(); |
| 339 |
update_user_meta( $user->ID, '_woocommerce_pos_uuid', $uuid ); |
| 340 |
|
| 341 |
return $uuid; |
| 342 |
} |
| 343 |
|
| 344 |
/** |
| 345 |
* Get the site UUID used as the `site` group key. |
| 346 |
* |
| 347 |
* Lazily provisions the site UUID if missing so admin-only |
| 348 |
* installs (fresh plugin activation, no POS frontend load yet) |
| 349 |
* still have a stable site identifier for grouping. |
| 350 |
*/ |
| 351 |
public function get_site_id(): string { |
| 352 |
$uuid = get_option( 'woocommerce_pos_uuid', '' ); |
| 353 |
if ( \is_string( $uuid ) && '' !== $uuid ) { |
| 354 |
return $uuid; |
| 355 |
} |
| 356 |
|
| 357 |
$uuid = Uuid::uuid4()->toString(); |
| 358 |
update_option( 'woocommerce_pos_uuid', $uuid ); |
| 359 |
|
| 360 |
return $uuid; |
| 361 |
} |
| 362 |
|
| 363 |
/** |
| 364 |
* Whether the given event name is a PostHog-reserved identifier |
| 365 |
* event that should not have a `$groups` binding auto-attached. |
| 366 |
* |
| 367 |
* @param string $event Event name. |
| 368 |
*/ |
| 369 |
private function is_reserved_event( string $event ): bool { |
| 370 |
return '$identify' === $event || '$groupidentify' === $event; |
| 371 |
} |
| 372 |
|
| 373 |
/** |
| 374 |
* Get default properties attached to every captured event. |
| 375 |
*/ |
| 376 |
private function get_default_properties(): array { |
| 377 |
return array( |
| 378 |
'plugin_version' => PLUGIN_VERSION, |
| 379 |
'pro_active' => class_exists( '\WCPOS\WooCommercePOSPro\WooCommercePOSPro' ), |
| 380 |
'locale' => get_locale(), |
| 381 |
); |
| 382 |
} |
| 383 |
|
| 384 |
/** |
| 385 |
* Dispatch a non-blocking HTTPS POST to the PostHog ingestion host. |
| 386 |
* |
| 387 |
* @param string $path Endpoint path (e.g. /capture/). |
| 388 |
* @param array $payload JSON payload. |
| 389 |
*/ |
| 390 |
private function send( string $path, array $payload ): bool { |
| 391 |
$url = $this->get_host() . $path; |
| 392 |
$body = wp_json_encode( $payload ); |
| 393 |
if ( false === $body ) { |
| 394 |
return false; |
| 395 |
} |
| 396 |
|
| 397 |
$response = wp_remote_post( |
| 398 |
$url, |
| 399 |
array( |
| 400 |
'blocking' => false, |
| 401 |
'timeout' => self::REQUEST_TIMEOUT, |
| 402 |
'headers' => array( 'Content-Type' => 'application/json' ), |
| 403 |
'body' => $body, |
| 404 |
) |
| 405 |
); |
| 406 |
|
| 407 |
return ! is_wp_error( $response ); |
| 408 |
} |
| 409 |
} |
| 410 |
|
